Sierra MP38910 Lever Operated Battery Disconnect Switch, 175A Continuous / 800A Intermittent

The Sierra MP38910 is a lever operated battery disconnect switch built to isolate a boat's battery from its electrical system when the vessel is not in use, helping prevent parasitic drain and reduce fire risk during storage or transport. The switch is rated for 175 amps continuous and 800 amps intermittent, making it suitable for cutting power to marine electrical circuits that see high startup or surge loads. Current flows through 3/8 inch brass terminals, chosen for their conductivity and corrosion resistance in a marine environment. The lever itself is chrome plated brass, giving it a durable, corrosion resistant finish that stands up to salt air and routine handling. A faceplate is included, allowing for a finished, panel-mounted installation. Operation is simple: the lever moves between on and off positions, giving boat owners a fast, manual way to fully disconnect the battery without pulling cable terminals. This switch is a straightforward replacement or upgrade for existing lever operated disconnect switches on boats, and its compact footprint suits helm panels, battery compartments, and other mounting locations where a manual disconnect is needed. Weighing 1.07 pounds, it is a rugged, panel-mount component intended for direct-current marine electrical systems.

Specifications

• Brand: Sierra
• Manufacturer Part Number: MP38910
• Product Type: Lever Operated Battery Disconnect Switch
• Continuous Current Rating: 175 amps
• Intermittent Current Rating: 800 amps
• Terminal Size: 3/8 inch brass terminals
• Lever Material/Finish: Chrome plated brass
• Included Hardware: Faceplate
• Material: Brass
• Color/Finish: Chrome
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 1.07 pounds

Frequently Asked Questions

What is the current rating of the Sierra MP38910 battery disconnect switch? The MP38910 is rated for 175 amps continuous and 800 amps intermittent, so it can handle both steady loads and short high-current surges on a marine 12-volt circuit.

Is the MP38910 a manual or automatic disconnect switch? It is a manual, lever operated switch. You move the chrome plated brass lever by hand to open or close the connection between the battery and the boat's electrical system.

Does the Sierra MP38910 come with a faceplate? Yes, a faceplate is included with the MP38910, allowing for a clean, finished panel-mount installation.

What size terminals does this switch use? The MP38910 uses 3/8 inch brass terminals for its battery and load connections.

What material is the lever made from? Chrome plated brass. The plating resists corrosion in the salt-air and humid conditions common in marine electrical compartments.

How much does the Sierra MP38910 weigh? The MP38910 battery disconnect switch weighs 1.07 pounds.

What are the dimensions of the MP38910 switch? The MP38910 measures approximately 0.39 x 0.39 x 0.39 inches for the core switch body, before the faceplate and lever.

Can the MP38910 be used to prevent battery drain during storage? Yes, flipping the lever to the off position on the Sierra MP38910 fully isolates the battery from the boat's wiring, which helps prevent parasitic drain when the boat is stored.

Is the Sierra MP38910 suitable for high-amperage marine circuits? With a 175 amp continuous and 800 amp intermittent rating, the MP38910 is built for higher-current marine DC circuits, not just small accessory loads.

Does the MP38910 require any special tools to install? The MP38910 mounts with its included faceplate and connects via 3/8 inch brass terminals, so installation uses standard marine electrical hand tools for terminating and securing the cables.